Making an offer on a house is one of the largest financial decisions most people face. Before you commit, a thorough inspection protects your investment and reveals hidden costs that could derail your purchase later. This checklist walks you through the critical areas to examine, the questions to ask, and the red flags that warrant a second opinion.
The inspection phase sits between your initial offer and closing. It’s your legal window to discover structural issues, system failures, and code violations. Many first-time buyers skip or rush this step, assuming the seller’s disclosure forms tell the whole story. They don’t.
Structural and Foundation Assessment
The foundation is the house’s skeleton. Cracks in the basement or crawl space, water stains, or uneven floors signal movement or settling problems. Walk the perimeter outside and look for:
- Horizontal or diagonal cracks wider than 1/8 inch
- Bowing or leaning walls
- Gaps between the house and the ground
- Efflorescence (white powder deposits from water seepage)
- Grading that slopes toward the foundation instead of away
A professional structural engineer costs $300 to $800 but can save tens of thousands. If the inspection report mentions foundation issues, request a licensed engineer’s assessment before proceeding.
Roof Condition and Age
Roof replacement runs $8,000 to $25,000 depending on size and material. Knowing the roof’s age and condition before you buy prevents surprise expenses in year two. Climb a ladder (safely) or use binoculars to examine shingles from the ground.
Look for:
- Missing, curled, or granule-shedding shingles
- Sagging or dips in the roofline
- Moss or algae growth
- Flashing gaps around chimneys and vents
- Visible daylight through attic boards
Ask the seller for roof documentation or receipts. Most asphalt shingles last 15 to 20 years. If the roof is near the end of its lifespan, factor replacement into your offer price or request the seller replace it before closing.
Plumbing and Water Systems
Water damage compounds over time and breeds mold. Test every faucet, shower, and toilet. Run water in multiple fixtures simultaneously to check water pressure and flow.
Key inspection points:
- Water stains on ceilings or walls
- Soft or spongy subfloors near bathrooms or kitchens
- Slow drains or backups
- Rust or corrosion on visible pipes
- Age and type of water heater (tankless units last 20 years; tank units, 10 to 15)
- Presence of a sump pump in the basement
If the house uses a septic system instead of municipal sewer, request a septic inspection and tank pumping records. Septic repairs or replacement can exceed $15,000.
Electrical System and Panel
Outdated or overloaded electrical systems pose fire and safety risks. Look at the main electrical panel in the basement or utility closet. Modern homes use 200-amp service; older homes may have 100-amp or less, which limits what you can run simultaneously.
Red flags include:
- Fuses instead of circuit breakers (indicates an older system)
- Aluminum wiring (fire hazard if not properly maintained)
- Double-tapped breakers (two wires on one breaker)
- Visible burn marks or scorch marks on the panel
- Outlets that don’t work or outlets without grounding (three prongs)
Hire a licensed electrician to inspect the panel and test outlets. Upgrading service from 100-amp to 200-amp costs $1,500 to $3,000.
HVAC and Climate Control
Heating and cooling systems are expensive to replace. A new furnace or air conditioner runs $5,000 to $12,000 installed. During your walkthrough, note the age of the units and ask for maintenance records.
Check:
- Age of the furnace and air conditioner
- Rust or corrosion on outdoor AC unit
- Leaks or water pooling around the indoor unit
- Uneven heating or cooling between rooms
- Thermostat responsiveness
- Ductwork condition and cleanliness
Request the last service records and filter replacement history. Well-maintained systems often outlast poorly maintained ones by years.
Interior Finishes and Hidden Damage
Paint and flooring hide problems. Look beneath the surface.
Examine:
- Water rings or stains on ceilings and walls
- Soft or bouncy subfloors
- Cracks in drywall (especially near windows or doors, which signal settling)
- Mold or mildew odors in bathrooms, basements, or crawl spaces
- Signs of pest damage: droppings, chewed wood, or entry holes
- Carpet stains or discoloration that may indicate past flooding
Mold remediation can cost $2,000 to $6,000 depending on extent. Pest treatment and prevention run $300 to $1,000 initially, plus ongoing costs.
Exterior and Grading
Walk the entire property perimeter. Poor grading causes water to pool against the foundation, leading to basement flooding and structural damage.
Look for:
- Gutters and downspouts that direct water away from the house
- Grading that slopes away from the foundation
- Cracks or gaps in the exterior siding or brick
- Rotting wood on decks, porches, or trim
- Driveway cracks or heaving (frost heave in northern climates)
- Fencing or retaining wall integrity
Grading corrections cost $500 to $2,000. Deck replacement runs $3,000 to $10,000.
Professional Inspection Reports and Next Steps
Hire a certified home inspector through the American Society of Home Inspectors or a similar credentialing body. A thorough inspection takes 2 to 4 hours and costs $300 to $600. The inspector will produce a detailed report listing every defect, its severity, and estimated repair costs.
Once you have the report, you have three options: renegotiate the price downward, request the seller make repairs before closing, or walk away. Many first-time buyers underestimate how much deferred maintenance compounds. A house with multiple small issues often signals a pattern of neglect that will cost more than the sum of individual repairs.
Market conditions influence your leverage. In a seller’s market, sellers may refuse renegotiation. In a buyer’s market, you have more room to request credits or repairs. Your real estate agent can advise on what’s negotiable in your local market.
The inspection period is your protection. Use it fully. The few hundred dollars spent on a thorough inspection can prevent six-figure mistakes.
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